Table 2:

Characteristics of surgically induced abortion procedures, patients and physicians who performed the procedure, categorized by low (< 10th percentile) and higher (≥ 10th percentile) physician induced-abortion volume in the previous year

CharacteristicNo. (%)* of physician IA procedure volume (< 10th percentile)
(n = 52 889)
No. (%)* of physician IA procedure volume (≥ 10th percentile)
(n = 476 252)
Standardized difference
IA procedure
Patient age, yr
 Mean ± SD26.9 ± 7.227.1 ± 6.90.02
 < 208414 (15.9)65 033 (13.7)0.06
 20–2415 091 (28.5)137 104 (28.8)0.01
 25–2911 034 (20.9)108 945 (22.9)0.05
 30–348581 (16.2)82 054 (17.2)0.03
 35–396639 (12.6)58 339 (12.2)0.01
 ≥ 403130 (5.9)24 777 (5.2)0.03
Rural residence5951 (11.3)24 514 (5.1)0.22
Neighbourhood income quintile
 Q1 (lowest)17 682 (33.4)138 761 (29.1)0.09
 Q212 120 (22.9)108 952 (22.9)0.00
 Q39180 (17.4)92 465 (19.4)0.05
 Q47740 (14.6)76 992 (16.2)0.04
 Q5 (highest)6167 (11.7)59 082 (12.4)0.02
World region of origin
 Canada40 835 (77.2)333 373 (70.0)0.16
 Africa1168 (2.2)12 885 (2.7)0.03
 Caribbean1297 (2.5)18 075 (3.8)0.08
 East Asia3648 (6.9)29 436 (6.2)0.03
 Hispanic America1080 (2.0)13 459 (2.8)0.05
 Middle East884 (1.7)9465 (2.0)0.02
 South Asia2560 (4.8)41 743 (8.8)0.16
 Western1417 (2.7)17 816 (3.7)0.06
Nulliparous25 495 (48.2)263 565 (55.3)0.14
No. of previous IAs
 031 288 (59.2)253 102 (53.1)0.12
 111 678 (22.1)104 700 (22.0)0.00
 24982 (9.4)51 040 (10.7)0.04
 ≥ 34941 (9.3)67 410 (14.2)0.15
Total no. of adjusted ADGs
 Median (IQR)5 (3–7)4 (3–7)0.07
 0–211 734 (22.2)115 461 (24.2)0.05
 3–413 657 (25.8)125 702 (26.4)0.01
 5–612 872 (24.3)113 941 (23.9)0.01
 ≥ 714 626 (27.7)121 148 (25.4)0.05
Gestational age at IA, wk
 Early IA < 15 wk50 853 (96.2)463 732 (97.4)0.07
 Late IA ≥ 15 wk2036 (3.8)12 520 (2.6)0.07
Location where IA was performed
 Within hospital45 593 (86.2)90 867 (19.1)1.82
 Outside of hospital7296 (13.8)385 385 (80.9)1.82
Year in which the IA was performed
 20035446 (10.3)36 783 (7.7)0.09
 20044832 (9.1)35 363 (7.4)0.06
 20054588 (8.7)36 377 (7.6)0.04
 20064490 (8.5)38 693 (8.1)0.01
 20074585 (8.7)38 925 (8.2)0.02
 20084430 (8.4)39 197 (8.2)0.01
 20093950 (7.5)39 217 (8.2)0.03
 20103947 (7.5)37 597 (7.9)0.02
 20113867 (7.3)37 131 (7.8)0.02
 20123832 (7.2)35 626 (7.5)0.01
 20133157 (6.0)34 837 (7.3)0.05
 20143250 (6.1)34 305 (7.2)0.04
 20152515 (4.8)32 201 (6.8)0.09
Physician who performed the procedure
No. of unique physicians40079
Male sex31 131 (58.9)216 212 (45.4)0.27
Graduated in Canada42 584 (80.5)326 652 (68.6)0.28
Specialty
 Obstetrics and gynecology39 245 (74.2)88 343 (18.5)1.34
 Family medicine or other13 644 (25.8)387 909 (81.5)1.34
Age, mean ±SD; yr50.5 ± 13.555.4 ± 10.40.41
No. years since graduation
 Mean ± SD24.8 ± 13.929.3 ± 11.00.36
 ≤ 2527 819 (52.6)150 978 (31.7)0.43
 ≥ 2625 070 (47.4)325 274 (68.3)0.43
No. of IA procedures performed in the previous year
 Mean ± SD95.4 ± 54.72142.5 ± 1713.21.69
 Median (IQR)98 (51–145)1609 (835–2949)2.70
  • Note: ADG = Aggregated Diagnosis Group, IA = induced abortion, IQR = interquartile range, SD = standard deviation.

  • * Unless otherwise indicated.

  • We considered a standardized difference greater than 0.10 to represent a meaninful significance.

  • Refers to all of Europe (including the United Kingdom, Wales, Scotland and Ireland), Australia, New Zealand and the United States.

  • § Based on the adjusted Johns Hopkins ADGs and derived from diagnostic information recorded in inpatient data for hospital admission, emergency department visits and visits to a physician.